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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Goaf  \Goaf\;  n.;  pl  {Goafs}or  {Goaves}.  [Cf.  lst  {Gob}.] 
  That  part  of  a  mine  from  which  the  mineral  has  been  partially 
  or  wholly  removed;  the  waste  left  in  old  workings;  --  called 
  also  {gob}  . 
  {To  work  the  goaf}  or  {gob},  to  remove  the  pillars  of  mineral 
  matter  previously  left  to  support  the  roof,  and  replace 
  them  with  props.  --Ure.